JP2905677B2 - Excavator for burying small-diameter pipe and method and apparatus for pulling back buried pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip excavator and a method of pulling back a buried pipe in a small-diameter pipe propulsion burial method and an apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, a pipe is buried by propelling a tip excavator and a subsequent buried pipe through a discharging pipe laid in the buried pipe while excavating earth and sand by a main pushing device installed in a starting shaft. In the small diameter pipe propulsion burial method, there was no way to return the excavator and buried pipe to the starting shaft side during the construction.

[0003]

Conventionally, since the excavator and the buried pipe cannot be pulled back in this way, the excavator may break down during construction, hit an obstacle, or greatly extend from the planned route. In the event that the excavation cannot be continued, such as when it comes off, there is no choice but to collect the excavator and buried pipe by excavating from the ground,
They spent a lot of money and time.

[0004] It is an object of the present invention to provide a simple method and apparatus which makes it possible to return a tip excavator and a buried pipe to a starting shaft side during construction by using a main pushing device and a discharge pipe. is there.

[0005]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 is characterized in that an excavator and a subsequent buried pipe are transported by excavating earth and sand through a discharge pipe laid in the buried pipe. Propulsion by the main pushing device installed in the starting shaft, connecting the buried pipes sequentially and burying in the ground during the construction of small diameter pipes, it became necessary to pull the tip excavator and the buried pipe back to the starting shaft side In this case, the pulling force generated in the return stroke of the main pushing device is applied to the tip excavator via the discharging pipe, and the tipping excavator and the buried pipe are pulled back together by the pulling force. It is a method of pulling back an excavator and a buried pipe.

According to a second aspect of the present invention, there is provided an apparatus used for carrying out the above-mentioned method, wherein a protrusion provided on the outer periphery of the discharge pipe and an outer periphery of the discharge pipe connection port of the push table of the main pushing device are provided. Detachable with the provided protrusion, which can be engaged across the protrusions only during the return stroke of the main pushing device, and can transmit the pulling force from the push base of the main pushing device to the discharging pipe connected to the tip excavator. An excavator for burying small-diameter pipes and a device for pulling back buried pipes, each of which comprises a simple connecting member.

[0007]

According to the first aspect of the present invention, the pulling force generated in the return stroke of the main pusher is applied to the tip excavator via a discharging pipe connected between the tip excavator and the main pusher. Pull back the excavator and buried pipe. For this purpose, according to the second aspect of the present invention, the connecting member is engaged over both the projecting portions of the discharge tube and the push table only during the return stroke of the main push device, and the pulling force is transmitted from the push table of the main push device to the discharge tube. Let it. In this case, the pushing force from the main pushing device is not applied to the connecting member and the discharging pipe during the buried pipe propulsion.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 4 and 5 are general views of a main pushing device installed in a starting shaft. As shown in FIG. 1, a main pushing device 1 includes a propulsion jack (only one of which is shown in the figure) 1-1 symmetrically arranged and a push table 1 coupled to a cylinder portion of each propulsion jack 1-1. -2 and each propulsion jack 1-1
Of the reaction force 1-3 coupled to the rod portion of
And a propulsion jack 1-1.
The push table 1-2 advances and retreats on the base 1-4 due to the expansion and contraction of the base 1-4. In addition to the propulsion of the tip excavator and the buried pipe in the advance process, the pulling force generated in the retreat, that is, the return stroke, in the present invention. The excavator and buried pipe are pulled back using

FIG. 6 shows a connection state of the tip excavator 2, the buried pipe 3, the discharge pipe 4, and the pusher 1-2 during the pipe burying work.

FIG. 7 is a detailed view of a joint portion of the buried pipe 3, and FIG. As the buried pipe 3, a fume pipe or a steel pipe is used. As shown in FIG. 7, each pipe end 3-1 is inserted into a steel collar 3-2, and water is stopped by a rubber seal 3-3. The connection is sequentially extended for each stroke of the pushing device 1. in this way,
Since the joint portion of the buried pipe 3 has a plug-in structure with no irregularities on the outer surface, it can transmit the pushing force from the main pushing device but cannot transmit the pulling force. On the other hand, the discharge pipe 4 is laid in the buried pipe 3 and is removed and collected after construction.
There are few restrictions on the material and the joint structure, a steel pipe having a high tensile strength is used for the pipe body, and a projection 4 provided on the outer periphery of the rear part of one of the pipes as shown in FIG.
-1 and a thread 4 provided at the front end of the other tube.
-2, a joint structure of a screw connection type using a union nut 4-3 and a rubber seal 4-4 can be adopted. Therefore, the joint of the discharge pipe 4 can have sufficient strength to transmit the pulling force from the main pushing device 1 necessary for pulling back the excavator 2 and the buried pipe 3. The material itself can sufficiently withstand the pulling force.

FIGS. 9 to 11 show an example of a tip excavator 2 used in this small-diameter pipe propulsion burying method.
A cutter head 2-2 having a large number of digging blades 2-3 is provided at a front portion of the excavator body 2-1.
-2 is rotated by the cutter drive motor 2-4, and the ground G
And excavated earth and sand are stirred and mixed by the excavation blade 2-3 with the viscosity imparting liquid (such as bentonite solution) injected into the ground G from the viscosity imparting liquid inlet 2-5 of the cutter head 2-2. It is converted into mud having plastic fluidity, and the mud is excavated while filling the mud passage 2-6 formed between the excavator main body 2-1 and the wall of the excavation hole of the ground G by the pressure from the face side. Sediment pump 2 mounted on the machine body 2-1
7 to the sediment intake 2-8, and the sediment pump 2
7, the air is pumped to the starting shaft through the discharging pipe 4 laid in the buried pipe 3 following the excavator body 2-1. At the same time, the tip excavator 2 and the subsequent buried pipe 3 are propelled by the pushing force from the above-described main pushing device 1 to bury the pipe. 9 to 11, reference numeral 2-9 denotes an excavator body 2-1.
2-10 is a connection adapter for connecting the excavator body 2-1 and the buried pipe 3. The end of the discharging pipe 4 connected to the sediment pump 2-7 is connected to the excavator body 2-1.
When the tip excavator 2 and the buried pipe 3 are pulled back, the pulling force applied to the earth removal pipe 4 from the main pushing device 1 can be transmitted to the excavator body 2-1. it can. In the small-diameter pipe propulsion burial method using the tip excavator 2, a part of the mud filled in the mud passage 2-6 also enters the gap between the buried pipe 3 and the wall surface of the excavation hole of the ground G. It serves as a lubricating material to help reduce the propulsion resistance and pullback resistance of the buried pipe 3.

FIG. 1 is a longitudinal sectional view of a main part showing a state where a tip excavator and a buried pipe are pulled back by using a pull-back apparatus of the present invention, and FIG. 2 is a view showing a state where a pull-back apparatus of the present invention is propelled when a buried pipe is propelled. FIG.

The pull-back device includes a projection 4-1 provided on the outer periphery of the rear portion of the discharging pipe 4 and a projection 1-6 provided on the outer circumference of the discharging pipe connection port 1-5 of the push table 1-2 of the main pushing device 1. And a connecting member 5 described below. As shown in detail in FIG. 3, the connection member 5 is a cylindrical body having front and rear ring-shaped ends 5-1 and 5-2 that protrude toward the inner peripheral side.
In order to make it detachable from the push table 1-2, it is divided into two by a plane including an axis, and flanges 5-4 and 5-5 provided with the divided surface 5-3 therebetween are bolted 5-6 and nut 5
Assembled together by tightening at -7.

To connect the discharge pipe 4 to the push table 1-2,
The rear end of the discharging pipe 4 carried into the starting shaft together with the buried pipe 3 and having the rubber seal 4-4 attached thereto is inserted into the discharging pipe connection port 1-5 of the push table 1-2, and the rear part of the push table 1-2. Is connected to the discharge pipe 6 connected to the drain pipe 6. In this state, the discharge pipe 4
And the connecting member 5 is put around the projections 4-1 and 1-6 of the push table 1-2, and assembled integrally as described above.

When it becomes necessary to pull back the excavator 2 and the buried pipe 3 during the pipe burying work, the propulsion jack 1-1 of the main pushing device 1 is switched to the return stroke to switch the pusher 1--1.
1, the push table 1-2 separates from the rear end of the buried pipe 3, and the ring-shaped ends 5-1 and 5-2 before and after the connecting member 5 are removed as shown in FIG. 1. 4 and push table 1
2 are engaged with the two projections 4-1 and 1-6, respectively, so that the pulling force can be transmitted from the push table 1-2 to the discharging pipe 4, and acts on the excavator 2 via the discharging pipe 4. Due to the pulling force, the tip excavator 2 and the subsequent buried pipe 3 are pulled back together to the starting shaft. After one withdrawal,
With the connecting member 5 removed, the previous discharge pipe 4 and the push table 1
-2, and pull back again. By repeating this, the entire excavator 2 and the following buried pipe 3 can be pulled back to the starting shaft and collected.

When the buried pipe is propelled, as shown in FIG. 2, even if the connecting member 5 is attached, a ring-shaped front and rear of the connecting member 5 is maintained until the pusher 1-2 hits the rear end of the buried pipe 3. The ends 5-1 and 5-2 and the projections 4-1 and 1-6 are separated from each other, so that no pressing force is applied to the connecting member 5 and the discharging pipe 4 from the main pressing device.

[0018]

According to the first aspect of the present invention, the excavator and the subsequent buried pipe are propelled by the main pushing device in the starting shaft while conveying the excavated earth and sand through the earth discharging pipe laid in the buried pipe. If a situation occurs where excavation cannot be continued during the burial of the bored pipe, the excavator and the buried pipe can be pulled back to the starting shaft by a simple method using the main pushing device and the discharge pipe. Excavation from the ground, which requires high construction cost and time, can be eliminated.

Further, according to the second aspect of the present invention, only during the return stroke of the main pushing device, via the connecting member which engages over the projections of both the push table of the main pushing device and the discharging pipe,
The pulling force required for pulling back the excavator and the buried pipe can be transmitted from the main pushing device to the discharging pipe, and no pushing force is applied to the connecting member and the discharging pipe when the buried pipe is propelled.
When it is necessary to pull back many times to correct the propulsion route, the propulsion and pull-back can be performed alternately and continuously.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing a state in which a tip excavator and a buried pipe are pulled back using a pullback device of the present invention.

FIG. 2 is a vertical sectional view showing a main part of the retraction device according to the present invention when a buried pipe is propelled.

3A and 3B are detailed views of a connecting member of the retraction device, wherein FIG. 3A is a longitudinal sectional view and FIG. 3B is a side view.

FIG. 4 is a side view of the main pushing device.

FIG. 5 is a plan view of a main pushing device.

FIG. 6 is a view showing a connection state of a tip excavator, a buried pipe, an earth discharging pipe, and a main pushing device.

FIG. 7 is a sectional view of a joint part of a buried pipe.

FIG. 8 is a sectional view of a joint portion of the discharge pipe.

FIG. 9 is a longitudinal sectional view showing a state where the tip excavator is excavating.

FIG. 10 is a view as viewed from the direction indicated by the arrow A in FIG. 9;

FIG. 11 is a sectional view taken along line BB of FIG. 9;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main pushing device, 1-1 ... Propulsion jack, 1-2 ... Push stand, 1-5 ... Discharge pipe connection port, 1-6 ... Projection part, 2 ... Tip excavator, 3 ... Burial pipe, 4 ... Discharge Clay pipe, 4-1 ... projecting part, 5
... Connecting members.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Matsunaga 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Shinichi Mizobuchi 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Japan (56) References JP-A-5-171891 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 9/06 311 E21D 9/12

Claims (2)

(57) [Claims] An excavating machine and a subsequent buried pipe are propelled by a main pushing device installed in a starting shaft while transporting excavated earth and sand through a discharging pipe laid in the buried pipe, and the buried pipes are sequentially connected. If it becomes necessary to return the excavator and the buried pipe to the starting shaft side during the construction of small diameter pipes buried in the ground, the pulling force generated in the return stroke of the main pushing device is passed through the discharge pipe. To work on the tip machine,
An excavator for burying a small-diameter pipe and a method for pulling back a buried pipe, wherein the excavator and the buried pipe are pulled back together by the pulling force. 2. A device used for carrying out the method according to claim 1, wherein the protrusion is provided on the outer periphery of the discharge pipe, and the protrusion is provided on the outer periphery of the discharge pipe connection port of the push table of the main pushing device. A detachable connection that engages with the projections over the two projections only during the return stroke of the main pushing device, and can transmit a pulling force from the push base of the main pushing device to the discharge pipe connected to the tip excavator. An excavator for burying small-diameter pipes and a device for pulling back buried pipes.